course washout in relation to autopilot
Thread Starter
Joined: Aug 1998
Posts: 320
Likes: 0
From: australia
course washout in relation to autopilot
Dear all,
What does the term course washout mean in regards to an autopilot?? ps I have looked in ac electric books for the explanantion!
thank you. dw.
What does the term course washout mean in regards to an autopilot?? ps I have looked in ac electric books for the explanantion!
thank you. dw.
Joined: Mar 2006
Posts: 1,974
Likes: 0
From: Choroni, sometimes
Hi,
course washout function on AP/FD is used to follow LOC in x-wind.
e.g. over a period of time (100s ?) the AP/FD takes the new heading as datum and if the course error is zero, it's washed out. You can proof it if you follow the LOC on a beautifull day and turn the ILS course in the CDI for some degree! The deviation remains (zero I hope
) but nevertheless your AP/FD will interpret it as a wind change, starts turning but will come back.
DON'T DO IT FOR AUTOLAND.
That's a different story.
regards
course washout function on AP/FD is used to follow LOC in x-wind.
e.g. over a period of time (100s ?) the AP/FD takes the new heading as datum and if the course error is zero, it's washed out. You can proof it if you follow the LOC on a beautifull day and turn the ILS course in the CDI for some degree! The deviation remains (zero I hope
) but nevertheless your AP/FD will interpret it as a wind change, starts turning but will come back.DON'T DO IT FOR AUTOLAND.
That's a different story.
regards
Joined: May 2002
Posts: 237
Likes: 5
From: UK
try this link which also covers the subject
http://www.pprune.org/tech-log/35204...737-800-a.html
http://www.pprune.org/tech-log/35204...737-800-a.html
